diff --git a/crypto/crypto.go b/crypto/crypto.go
index 25f317545..035d304a8 100644
--- a/crypto/crypto.go
+++ b/crypto/crypto.go
@@ -71,7 +71,7 @@ var poly1305KeyMask = [16]byte{
 }
 
 // key is a [32]byte, in the form k||r
-func poly1305_sign(msg []byte, nonce []byte, key *SigningKey) []byte {
+func poly1305Sign(msg []byte, nonce []byte, key *SigningKey) []byte {
 	// prepare key for low-level poly1305.Sum(): r||n
 	var k [32]byte
 
@@ -113,7 +113,7 @@ func macKeyFromSlice(mk *SigningKey, data []byte) {
 }
 
 // key: k||r
-func poly1305_verify(msg []byte, nonce []byte, key *SigningKey, mac []byte) bool {
+func poly1305Verify(msg []byte, nonce []byte, key *SigningKey, mac []byte) bool {
 	// prepare key for low-level poly1305.Sum(): r||n
 	var k [32]byte
 
@@ -228,7 +228,7 @@ func Encrypt(ks *Key, ciphertext, plaintext []byte) ([]byte, error) {
 	copy(ciphertext, iv[:])
 	ciphertext = ciphertext[:ivSize+len(plaintext)]
 
-	mac := poly1305_sign(ciphertext[ivSize:], ciphertext[:ivSize], &ks.Sign)
+	mac := poly1305Sign(ciphertext[ivSize:], ciphertext[:ivSize], &ks.Sign)
 	ciphertext = append(ciphertext, mac...)
 
 	return ciphertext, nil
@@ -252,7 +252,7 @@ func Decrypt(ks *Key, plaintext, ciphertext []byte) ([]byte, error) {
 	ciphertext, mac := ciphertext[:l], ciphertext[l:]
 
 	// verify mac
-	if !poly1305_verify(ciphertext[ivSize:], ciphertext[:ivSize], &ks.Sign, mac) {
+	if !poly1305Verify(ciphertext[ivSize:], ciphertext[:ivSize], &ks.Sign, mac) {
 		return nil, ErrUnauthenticated
 	}
 
diff --git a/crypto/crypto_int_test.go b/crypto/crypto_int_test.go
index c7b06e418..881dff649 100644
--- a/crypto/crypto_int_test.go
+++ b/crypto/crypto_int_test.go
@@ -48,13 +48,13 @@ func TestPoly1305(t *testing.T) {
 		key := &SigningKey{}
 		copy(key.K[:], test.k)
 		copy(key.R[:], test.r)
-		mac := poly1305_sign(test.msg, test.nonce, key)
+		mac := poly1305Sign(test.msg, test.nonce, key)
 
 		if !bytes.Equal(mac, test.mac) {
 			t.Fatalf("wrong mac calculated, want: %02x, got: %02x", test.mac, mac)
 		}
 
-		if !poly1305_verify(test.msg, test.nonce, key, test.mac) {
+		if !poly1305Verify(test.msg, test.nonce, key, test.mac) {
 			t.Fatalf("mac does not verify: mac: %02x", test.mac)
 		}
 	}
diff --git a/crypto/writer.go b/crypto/writer.go
index 856fb5fff..5ac51ee8d 100644
--- a/crypto/writer.go
+++ b/crypto/writer.go
@@ -22,7 +22,7 @@ type encryptWriter struct {
 
 func (e *encryptWriter) Close() error {
 	// write mac
-	mac := poly1305_sign(e.data.Bytes()[ivSize:], e.data.Bytes()[:ivSize], &e.key.Sign)
+	mac := poly1305Sign(e.data.Bytes()[ivSize:], e.data.Bytes()[:ivSize], &e.key.Sign)
 	_, err := e.origWr.Write(mac)
 	if err != nil {
 		return err